DE2220679B1 - VERTICAL MIXER - Google Patents
VERTICAL MIXERInfo
- Publication number
- DE2220679B1 DE2220679B1 DE19722220679 DE2220679A DE2220679B1 DE 2220679 B1 DE2220679 B1 DE 2220679B1 DE 19722220679 DE19722220679 DE 19722220679 DE 2220679 A DE2220679 A DE 2220679A DE 2220679 B1 DE2220679 B1 DE 2220679B1
- Authority
- DE
- Germany
- Prior art keywords
- screws
- mixing
- mass
- mixer
- mixing container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23G—COCOA; COCOA PRODUCTS, e.g. CHOCOLATE; SUBSTITUTES FOR COCOA OR COCOA PRODUCTS; CONFECTIONERY; CHEWING GUM; ICE-CREAM; PREPARATION THEREOF
- A23G1/00—Cocoa; Cocoa products, e.g. chocolate; Substitutes therefor
- A23G1/04—Apparatus specially adapted for manufacture or treatment of cocoa or cocoa products
- A23G1/10—Mixing apparatus; Roller mills for preparing chocolate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/95—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis
- B01F27/951—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis with at least one stirrer mounted on the sun axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/13—Openwork frame or cage stirrers not provided for in other groups of this subclass
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
- B01F27/95—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis
- B01F27/953—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers having planetary motion, i.e. rotating about their own axis and about a sun axis using only helical stirrers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/09—Stirrers characterised by the mounting of the stirrers with respect to the receptacle
- B01F27/091—Stirrers characterised by the mounting of the stirrers with respect to the receptacle with elements co-operating with receptacle wall or bottom, e.g. for scraping the receptacle wall
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/05—Stirrers
- B01F27/11—Stirrers characterised by the configuration of the stirrers
- B01F27/114—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections
- B01F27/1143—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections screw-shaped, e.g. worms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
- B01F27/23—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis
- B01F27/232—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes
- B01F27/2322—Mixers with rotary stirring devices in fixed receptacles; Kneaders characterised by the orientation or disposition of the rotor axis with two or more rotation axes with parallel axes
Description
men, ergeben sich insofern, als die Schnecken zentrisch oder exzentrisch und um die Behälterachse drehbar angeordnet sein können und daß sowohl die Schnecken als auch das Rührwerk gleich oder gegenläufig bezüglich ihres Antriebes ausgebildet sein können. Schließlich kann auch das Rührwerk als eine der Schnecken ausgebildet sein, wobei jedoch zwecks Erfassung aller Masseteilchen der Mischbehälterinnendurchmesser dem zweifachen Schneckendurchmesser minus etwa einer Schneckenganghöhe ent- ίο spricht und die Schnecken radial in bezug auf die Mischbehälterachse angeordnet sind.men arise insofar as the screws are centric or eccentric and around the container axis can be rotatably arranged and that both the screws and the agitator rotate in the same direction or in opposite directions can be designed with respect to their drive. Finally, the agitator can also be used as a of the screws, but the inside diameter of the mixing container for the purpose of detecting all mass particles twice the screw diameter minus about one screw pitch speaks and the screws are arranged radially with respect to the mixing container axis.
Der erfindungsgemäße Mischer wird nachfolgend an Hand der zeichnerischen Darstellung von Ausführungsbeispielen näher erläutert. In dieser Darstellung zeigt schematischThe mixer according to the invention is illustrated below with reference to the graphic representation of exemplary embodiments explained in more detail. In this illustration shows schematically
F i g. 1 einen Schnitt durch den Mischer undF i g. 1 shows a section through the mixer and
F i g. 2 einen Schnitt durch eine andere Ausführungsform des Mischers.F i g. 2 shows a section through another embodiment of the mixer.
In den F i g. 1 und 2 sind mit 1 die in den Innenraum 4 des Mischbehälters 2 einragenden Schnecken bezeichnet, die exzentrisch zur Behälterachse 3 bei dieser Ausführungsform angeordnet sind. Die Schnecken 1 sind an einem Träger 5 gelagert, der selbst dreh- und antreibbar am Behälter gelagert ist (nicht dargestellt). Ihre Drehbewegung um ihre eigenen Achsen erhalten die Schnecken 1 von der Welle 6. Der Träger 5 selbst ist gleichzeitg mit einem Rührwerk 7 versehen.In the F i g. 1 and 2 are with 1 the screws protruding into the interior 4 of the mixing container 2 denotes, which are arranged eccentrically to the container axis 3 in this embodiment. the Screws 1 are mounted on a carrier 5 which is itself mounted on the container such that it can rotate and be driven (not shown). The worms 1 receive their rotary motion about their own axes from the Shaft 6. The carrier 5 itself is provided with an agitator 7 at the same time.
Der Mischbehälter kann auch eine andere als die dargestellte Form haben und auch als geschlossener Behälter ausgebildet sein.The mixing container can also have a shape other than that shown and also as a closed one Be formed container.
Bei der Ausführungsvariante nach F i g. 2 bildet die Schnecke Γ gewissermaßen selbst das Rührwerk. In Rücksicht auf eine Zwangserfassung aller Masseteilchen sind dabei die Schnecken und der Mischbehälter 2' so bemessen, daß der Mischbehälterinnendurchmesser mindestens den zweifachen Schneckendurchmesser minus etwa mindestens einer Schnekkenganghöhe entspricht und die Schnecken 1,1' radial in bezug auf die Mischbehälterachse 3 angeordnet sind. Die erweiternde Maßgabe »mindestens« ist hierbei so zu verstehen, daß also zwei oder mehr Schnecken radial zur Behälterachse angeordnet sind. Bei dieser Ausbildung rücken also gewissermaßen in breiter Front die Schnecken gegen die Masse vor, ohne daß sich dabei Masseteilchen ihrem Einfluß entziehen können, und zwar im gleichen Sinn, wie dies bei der Variante nach F i g. 1 der Fall ist, wo das Rührwerk 7 die Masse immer wieder in den Einzugsbereich der Schnecken drückt und eventuelle Kanalbildungen in der Masse immer wieder zum Einsturz bringt.In the variant according to FIG. 2, the screw Γ itself forms the agitator, so to speak. In view of the compulsory collection of all mass particles, the screws and the mixing container are here 2 'dimensioned so that the inside diameter of the mixing container is at least twice the screw diameter minus approximately corresponds to at least one screw pitch and the screws 1.1 'radially are arranged with respect to the mixing container axis 3. The broadening requirement is "at least" to be understood here as meaning that two or more screws are arranged radially to the container axis. With this training, the snails move towards the mass in a broad front, without mass particles being able to evade their influence, in the same sense as this in the case of the variant according to FIG. 1 is the case where the agitator 7 keeps moving the mass into the catchment area the snail pushes and possible channel formations in the mass again and again Brings collapse.
Bei der Variante nach F i g. 2 wäre es also durchaus möglich, den gesamten Mischbehälterquerschnitt mit Schnecken zu besetzen, wobei die im Mischbehälter befindliche Gesamtmasse gewissermaßen in zwei Fronten auf die Schnecken zuströmt.In the variant according to FIG. 2 it would therefore be entirely possible to cover the entire cross-section of the mixing container to be populated with snails, the total mass in the mixing tank to a certain extent in two fronts flows towards the snails.
Bei allen Varianten ist vorteilhaft bei relativ geringem baulichem Aufwand erreicht, eine ständige Umwälzung der Masse von unten nach oben und wieder nach unten, eine zwangläufige Erfassung aller Teilchen, eine permanente Selbstreinigung der Schnecken und eine sichere Vermeidung von Kanalbildungen in der Masse in der Arbeitsphase, in der sie noch nicht fließfähig ist.In all variants, constant circulation is advantageously achieved with relatively little structural effort of the mass from bottom to top and back down again, an inevitable capture of all particles, a permanent self-cleaning of the snails and a safe avoidance of channel formation in the mass in the working phase in which it is not yet flowable.
Hierzu 1 Blatt Zeichnungen 1 sheet of drawings
COPYCOPY
Claims (4)
hend aus einem Mischbehälter mit mehreren drehba- Für die im vorliegenden Fall insbesondere zu be-The invention relates to a. Vertical mixer for the arrangement and: the movement of the screws, the mixing, homogenization and emulsification, so they are repeatedly immersed in and out of the mass during one cycle of masses that can be separated in certain work phases, which therefore do not add anything like chocolate masses or the like in particular, is subject to constant gravity movement,
starting from a mixing container with several rotatable
1116195, der deutschen Offenlegungsschrift Demgegenüber handelt es sich beim erfmdungsge-Mixers of the type mentioned are already known, detection of all parts by mass during the continuous pass, for example according to the German interpretation 5 °, is not guaranteed.
1116195, the German Offenlegungsschrift On the other hand, it is the invented
Priority Applications (16)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
BE794985D BE794985A (en) | 1972-04-27 | VERTICAL MIXER | |
DE2220679A DE2220679C2 (en) | 1972-04-27 | 1972-04-27 | Vertical mixer |
GB628373A GB1426521A (en) | 1972-04-27 | 1973-02-08 | Mixing machinesx |
AT166073A AT322958B (en) | 1972-04-27 | 1973-02-26 | VERTICAL MIXER |
CH291073A CH556687A (en) | 1972-04-27 | 1973-02-28 | VERTICAL MIXER. |
FR7307971A FR2181793B1 (en) | 1972-04-27 | 1973-03-06 | |
US339107A US3861656A (en) | 1972-04-27 | 1973-03-08 | Vertical mixer |
NL7303418A NL7303418A (en) | 1972-04-27 | 1973-03-12 | |
CS1844A CS170468B2 (en) | 1972-04-27 | 1973-03-14 | |
IT21624/73A IT981408B (en) | 1972-04-27 | 1973-03-14 | VERTICAL MIXER FOR MIXING HOMOGENIZATION AND EMULSIONING OF MASSES AS FOR EXAMPLE OF CHOCOLATE MASSES AND THE LIKE |
ES412627A ES412627A1 (en) | 1972-04-27 | 1973-03-14 | Vertical mixer |
SU1894759A SU548190A3 (en) | 1972-04-27 | 1973-03-14 | A device for mixing pastry masses |
PL1973161287A PL85001B1 (en) | 1972-04-27 | 1973-03-15 | |
JP48029572A JPS5744370B2 (en) | 1972-04-27 | 1973-03-15 | |
YU682/73A YU35963B (en) | 1972-04-27 | 1973-03-15 | Vertical mixer |
BR731841A BR7301841D0 (en) | 1972-04-27 | 1973-03-15 | VERTICAL MIXER VERTICAL MIXER |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2220679A DE2220679C2 (en) | 1972-04-27 | 1972-04-27 | Vertical mixer |
Publications (2)
Publication Number | Publication Date |
---|---|
DE2220679B1 true DE2220679B1 (en) | 1973-03-01 |
DE2220679C2 DE2220679C2 (en) | 1973-10-11 |
Family
ID=5843450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE2220679A Expired DE2220679C2 (en) | 1972-04-27 | 1972-04-27 | Vertical mixer |
Country Status (16)
Country | Link |
---|---|
US (1) | US3861656A (en) |
JP (1) | JPS5744370B2 (en) |
AT (1) | AT322958B (en) |
BE (1) | BE794985A (en) |
BR (1) | BR7301841D0 (en) |
CH (1) | CH556687A (en) |
CS (1) | CS170468B2 (en) |
DE (1) | DE2220679C2 (en) |
ES (1) | ES412627A1 (en) |
FR (1) | FR2181793B1 (en) |
GB (1) | GB1426521A (en) |
IT (1) | IT981408B (en) |
NL (1) | NL7303418A (en) |
PL (1) | PL85001B1 (en) |
SU (1) | SU548190A3 (en) |
YU (1) | YU35963B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016107777A1 (en) * | 2014-12-30 | 2016-07-07 | Nestec S.A. | Cooking apparatus |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL7311901A (en) * | 1973-08-29 | 1975-03-04 | Terlet Nv Maschf | MIXER. |
DE2510708C3 (en) * | 1975-03-12 | 1978-08-10 | Maschinenfabrik J.S. Petzholdt, 6000 Frankfurt | Method and device for the continuous production of milk chocolate masses |
JPH0321465Y2 (en) * | 1985-06-06 | 1991-05-10 | ||
DE3823326A1 (en) * | 1988-07-09 | 1990-01-11 | Janke & Kunkel Kg | DRIVE UNIT FOR A STIRRING AND / OR KNEADING MACHINE |
IE903986A1 (en) * | 1990-04-24 | 1991-11-06 | Lancet Sa | Cooking device |
US5200220A (en) * | 1992-04-03 | 1993-04-06 | Mars, Incorporated | Chocolate conching |
DK0605692T3 (en) * | 1992-07-22 | 1998-01-26 | Heinrich Wuester | Compost container with agitator |
US5368386A (en) * | 1993-11-16 | 1994-11-29 | Murray; William M. | Manual bone cement mixing device |
DE10248333A1 (en) * | 2002-01-25 | 2003-12-04 | Bayer Ag | Dynamic mixer |
DE60329086D1 (en) * | 2002-03-14 | 2009-10-15 | Stryker Corp | MIXING ASSEMBLY FOR MIXING BONE CEMENT |
EP1394246A1 (en) * | 2002-06-20 | 2004-03-03 | U.T.S. Umwelt-Technik-Süd GmbH | Stirring arrangement for a biogas fermenter as well as the process for the distribution of biomass in a fermentation liquid by using a stirring arrangement |
DE102004034395A1 (en) * | 2004-07-16 | 2006-02-16 | Bayer Technology Services Gmbh | Dynamic mixer |
EP2145571A1 (en) * | 2008-06-11 | 2010-01-20 | Koninklijke Philips Electronics N.V. | A kneading device for kneading ingredients into dough and a kneading tool |
US20120192723A1 (en) * | 2011-02-02 | 2012-08-02 | Bogdan Pototsky | Shish kebob rotisserie device |
CN103920443B (en) * | 2014-03-24 | 2016-01-13 | 中国化学赛鼎宁波工程有限公司 | A kind of catalyst preparation still prepared for carbon dioxide-epoxypropane copolymer |
CN108622472A (en) * | 2018-04-27 | 2018-10-09 | 深圳高佳研机械研究设计有限公司 | A kind of mixed fertilizer agitating-bagging equipment |
CN108802333B (en) * | 2018-06-06 | 2020-12-11 | 江苏天宇检测技术有限公司 | Soil pollution detection device |
CN110833783A (en) * | 2019-11-01 | 2020-02-25 | 上海蓓蕊医疗科技有限公司 | ECM glues agitating unit |
CN111420604A (en) * | 2020-04-07 | 2020-07-17 | 重庆市好迪涂料有限公司 | PH value adjusting device for paint production |
TWI743949B (en) * | 2020-08-17 | 2021-10-21 | 弘鈺機械工業有限公司 | Planetary dispersing three-shaft mixer |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR518083A (en) * | 1920-05-21 | 1921-05-19 | Armand Simon | Apparatus intended for working with cocoa, chocolate or other similar masses |
US2719703A (en) * | 1952-12-24 | 1955-10-04 | Boakes Isabella | Automatic cooking and stirring device |
US3248091A (en) * | 1962-01-25 | 1966-04-26 | Brighton Corp | Cooker-mixer |
US3482823A (en) * | 1968-03-08 | 1969-12-09 | Brighton Corp | Mixing kettle |
FR2040871A5 (en) * | 1969-04-16 | 1971-01-22 | Guittard Yves | A mixer-blender |
US3614070A (en) * | 1969-05-26 | 1971-10-19 | Baker Perkins Inc | Multiple orbiting screw mixing apparatus |
-
0
- BE BE794985D patent/BE794985A/en not_active IP Right Cessation
-
1972
- 1972-04-27 DE DE2220679A patent/DE2220679C2/en not_active Expired
-
1973
- 1973-02-08 GB GB628373A patent/GB1426521A/en not_active Expired
- 1973-02-26 AT AT166073A patent/AT322958B/en not_active IP Right Cessation
- 1973-02-28 CH CH291073A patent/CH556687A/en not_active IP Right Cessation
- 1973-03-06 FR FR7307971A patent/FR2181793B1/fr not_active Expired
- 1973-03-08 US US339107A patent/US3861656A/en not_active Expired - Lifetime
- 1973-03-12 NL NL7303418A patent/NL7303418A/xx not_active Application Discontinuation
- 1973-03-14 IT IT21624/73A patent/IT981408B/en active
- 1973-03-14 ES ES412627A patent/ES412627A1/en not_active Expired
- 1973-03-14 CS CS1844A patent/CS170468B2/cs unknown
- 1973-03-14 SU SU1894759A patent/SU548190A3/en active
- 1973-03-15 BR BR731841A patent/BR7301841D0/en unknown
- 1973-03-15 PL PL1973161287A patent/PL85001B1/pl unknown
- 1973-03-15 JP JP48029572A patent/JPS5744370B2/ja not_active Expired
- 1973-03-15 YU YU682/73A patent/YU35963B/en unknown
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2016107777A1 (en) * | 2014-12-30 | 2016-07-07 | Nestec S.A. | Cooking apparatus |
Also Published As
Publication number | Publication date |
---|---|
BE794985A (en) | 1973-05-29 |
PL85001B1 (en) | 1976-04-30 |
IT981408B (en) | 1974-10-10 |
US3861656A (en) | 1975-01-21 |
ES412627A1 (en) | 1976-01-01 |
FR2181793A1 (en) | 1973-12-07 |
JPS5744370B2 (en) | 1982-09-21 |
BR7301841D0 (en) | 1974-06-27 |
GB1426521A (en) | 1976-03-03 |
FR2181793B1 (en) | 1977-04-22 |
SU548190A3 (en) | 1977-02-25 |
DE2220679C2 (en) | 1973-10-11 |
CH556687A (en) | 1974-12-13 |
YU68273A (en) | 1981-04-30 |
AT322958B (en) | 1975-06-25 |
CS170468B2 (en) | 1976-08-27 |
NL7303418A (en) | 1973-10-30 |
YU35963B (en) | 1981-11-13 |
JPS4917557A (en) | 1974-02-16 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE2220679B1 (en) | VERTICAL MIXER | |
DE3228161C1 (en) | Feeding device for feeding plastic granulate into an injection molding unit | |
DE1213385C2 (en) | MIXER | |
DE102010000039A1 (en) | Device for the production of ice cream and similar products | |
DE2247518C3 (en) | mixer | |
DE2924318A1 (en) | TWO-STAGE EXTERNAL COMPRESSING DEVICE FOR POWDER-SHAPED PLASTICS | |
DE2510963A1 (en) | DEVICE FOR INKING COLORLESS PLASTIC GRANULES | |
DE102017123164B3 (en) | Device for treating a product | |
DE1679879B1 (en) | KNEDE AND MIXING MACHINE FOR PLASTIC MASSES | |
DE202004002601U1 (en) | Device for dosing bulk goods with an agitator and a drive unit | |
DE3616894A1 (en) | DEVICE FOR MIXING SAND FOR FOUNDRY SHAPES OR CORES | |
DE4235528C2 (en) | Device for dosing and mixing two different, viscous compositions, in particular dental compositions | |
DE2360644B2 (en) | DEVICE FOR MIXING METERED QUANTITIES OF A PLASTIC AND AT LEAST ONE ADDITIVE | |
DE1120850B (en) | Mixer | |
DE4217585A1 (en) | Method of production of slab of reconstituted stone - involves filling mould from hopper equipped with rotor | |
DE3833529C2 (en) | Solid material mixing device | |
DE2314344C2 (en) | Mixer for the continuous preparation of free-flowing mix | |
DE805754C (en) | Mixer | |
DE2043608C2 (en) | Pan mixer | |
DE2361376C3 (en) | Device for dosing granular, powdery or highly viscous substances | |
DE7930670U1 (en) | MACHINE FOR PRODUCING PASTA | |
DE1281947B (en) | Bulk goods container | |
DE7613332U1 (en) | EQUIPMENT FOR MIXING AND DOSING OF FLOWABLE MATERIALS | |
DE7930602U1 (en) | MACHINE FOR PRODUCING PASTA | |
DE1457103C (en) | Mixing device with a conically widening mixing container |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
E77 | Valid patent as to the heymanns-index 1977 |